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Abstract

LaOBr:Nd3+/Yb3+ has been prepared via a high temperature solid-state method, and near-infrared (NIR) quantum cutting (QC) luminescence in this system has been demonstrated. NIR luminescence of LaOBr:Nd3+/Yb3+ has been investigated by excitation, emission spectra and lifetime measurements, respectively. After absorption of a single 363 nm photon, downconversion (DC) occurs from the Nd3+ 4G9/2 level via the cross-relaxation process Nd3+ (4G9/2→4F3/2), Yb3+ (2F7/2→2F5/2), followed by a second energy transfer step from Nd3+ (4F3/2 level) to Yb3+ (2F5/2 level), leading to the emission of two IR photons from Yb3+, which is a promising avenue to boost the efficiency of solar cells with a twofold increase in the photon number.

Fig. 2 PLE spectrum of the Nd3+:4F2/3-4I11/2 emission (1082 nm) and NIR PL spectrum under excitation of 363 nm (Nd3+:4I9/2-4D1/2) in LaOBr:5%Nd3+, and the inset shows the tendency of the Nd3+ emission intensities (1082 nm) as a function of te Nd3+ doping concentrations in LaOBr:xNd3+.

Fig. 3 Left side: PLE spectra of Nd3+:4F2/3-4I11/2 emission (1082 nm) and the Yb3+:2F2/5-2F2/7 emission (1020 nm) in LaOBr:5%Nd3+,5%Yb3+. Right side: The dependence of the NIR PL spectra upon excitation of 363 nm (Nd3+:4I9/2-4D1/2) on Yb3+ doping concentrations in LaOBr:5%Nd3+,xYb3+.

Fig. 4 (a) The dependence of the NIR emission intensities at 1020 nm (Yb3+:2F2/5-2F2/7) and 1082 nm (Nd3+:4F2/3-4I11/2) on the doping concentrations. (b) Lifetime and ETE as a function of the Yb3+ doping concentrations in LaOBr:5%Nd3+,xYb3+.